[Dxspider-support] Permanent Blocking of Nodes

[Kin EA3CV]

Morning,

For sysops who are still receiving connection attempts from unwanted 
nodes, the definitive solution is to block the IPs at the TCP/IP level. 
This will ensure no more unnecessary traffic in the network.

For those who are not familiar with configuring their firewall, here's 
how to do it depending on the type of firewall you have installed:

Using iptables:

sudo iptables -A INPUT -s <IP_to_block> -j DROP
sudo service iptables save

Using firewalld:

sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source 
address="<IP_to_block>" drop'
sudo firewall-cmd --reload

Using ufw:

sudo ufw deny from <IP_to_block>

73 de Kin EA3CV

PS
This also applies to users.

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